/* * Copyright (C) 2011 Google Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above * copyright notice, this list of conditions and the following disclaimer * in the documentation and/or other materials provided with the * distribution. * * Neither the name of Google Inc. nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef WebVTTTokenizer_h #define WebVTTTokenizer_h #if ENABLE(VIDEO_TRACK) #include "InputStreamPreprocessor.h" #include "WebVTTToken.h" #include <wtf/PassOwnPtr.h> namespace WebCore { class WebVTTTokenizerState { public: enum State { DataState, EscapeState, TagState, StartTagState, StartTagClassState, StartTagAnnotationState, EndTagState, EndTagOpenState, TimestampTagState, }; }; class WebVTTTokenizer { WTF_MAKE_NONCOPYABLE(WebVTTTokenizer); WTF_MAKE_FAST_ALLOCATED; public: static PassOwnPtr<WebVTTTokenizer> create() { return adoptPtr(new WebVTTTokenizer); } typedef WebVTTTokenizerState State; void reset(); bool nextToken(SegmentedString&, WebVTTToken&); inline bool haveBufferedCharacterToken() { return m_token->type() == WebVTTToken::Type::Character; } inline void bufferCharacter(UChar character) { ASSERT(character != kEndOfFileMarker); m_token->ensureIsCharacterToken(); m_token->appendToCharacter(character); } inline bool emitAndResumeIn(SegmentedString& source, State::State state) { m_state = state; source.advanceAndUpdateLineNumber(); return true; } inline bool emitEndOfFile(SegmentedString& source) { if (haveBufferedCharacterToken()) return true; m_state = State::DataState; source.advanceAndUpdateLineNumber(); m_token->clear(); m_token->makeEndOfFile(); return true; } bool shouldSkipNullCharacters() const { return true; } private: WebVTTTokenizer(); // m_token is owned by the caller. If nextToken is not on the stack, // this member might be pointing to unallocated memory. WebVTTToken* m_token; WebVTTTokenizerState::State m_state; Vector<LChar, 32> m_buffer; // ://www.whatwg.org/specs/web-apps/current-work/#preprocessing-the-input-stream InputStreamPreprocessor<WebVTTTokenizer> m_inputStreamPreprocessor; }; } #endif #endif